9. Ocean World, Day 1: Practice comparing numbers (FP)

teaches Common Core State Standards CCSS.Math.Content.1.NBT.B.3 http://corestandards.org/Math/Content/1/NBT/B/3
teaches Common Core State Standards CCSS.Math.Practice.MP2 http://corestandards.org/Math/Practice/MP2

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Lesson objective: Compare two two-digit numbers using a < or > symbol.

This lesson helps to build fluency with two-digit comparisons. The game Ocean World is used here because it supports place value connections. This work develops students' understanding that two two-digit numbers can be compared using the < or > symbol.

Students engage in Mathematical Practice #2 (reason abstractly and quantitatively) as they critically think about the relationship between quantities, using flexible thinking of mathematical symbols.

Key vocabulary:

• compare
• create
• digit
• equals sign
• equation
• less
• less than
• greater than
• more
• ones
• similar
• symbol
• tens
• value

Special materials needed:

• base ten blocks
• connecting cubes
• Ocean World cards
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